Xun Shangpei, Zhai Wuquan, Fan Wei. MODIS in monitoring the chlorophyll-a concentrations of Chaohu Lake. J Appl Meteor Sci, 2009, 20(1): 95-101.
Citation: Xun Shangpei, Zhai Wuquan, Fan Wei. MODIS in monitoring the chlorophyll-a concentrations of Chaohu Lake. J Appl Meteor Sci, 2009, 20(1): 95-101.

MODIS in Monitoring the Chlorophyll-a Concentrations of Chaohu Lake

  • Received Date: 2007-11-14
  • Rev Recd Date: 2008-08-22
  • Publish Date: 2009-02-28
  • Using remote sensing data for large area water quality survey is a typical water environment monitoring method. The Chaohu Lake reflectance spectra are measured using ASD field spectrometer and the MODIS data collected during the same period. After the MODIS data are preprocessed, the spectral characteristics of Chaohu Lake are analyzed and the spectral is compared with references. Then the relation between the measured water reflectance and chlorophyll a is fitted. The fitting formula is consistent with previous research results and the correction coefficient is 0.75. But after analyzing the apparent reflectance of the MODIS L1B and the measured concentration of the chlorophyll-a, the ideal inversion lake model can not be obtained because of the influence of the atmosphere and other factors. After a special atmospheric correction for MODIS data, the ground reflectance spectra are obtained in the channels 1—7. The relation between the ground reflectance and the chlorophyll a is fitted and the correction coefficient is improved. At last, the optimum bands combination are chosen after analyzing the relation between the reflectance spectra and the corresponding moment of the concentration of the chlorophyll a, using EOS/MODIS data after atmospheric correction. The chlorophyll a index IChla is defined. Therefore the inversion model for chlorophyll a concentration of Chaohu Lake is achieved, and the correction coefficient is 0.5079. This correction coefficient is not as good as the result(0.75)obtained by the hyperspectral data measured by the field spectrometer. There are 3 possibilities that may cause the errors. First, the bands selection of the MODIS data are not cover exactly the spectral sensitive of the concentration of the chlorophyll a(685—715 nm). Second, the narrowband of the field spectrometer and broadband of the MODIS data is not very exact. Third, the atmospheric correction errors above Chaohu Lake may be too big.
  • Fig. 1  Sampling location in Chaohu Lake

    Fig. 2  The original(a)and normalized(b)spectral reflectance of light over Chaohu Lake on Jan 10, 2003

    Fig. 3  Relationship between chlorophyll-a concentrations and the reflectance ratios

    Fig. 4  Relationships between chlorophyll-a concentrations and the IChla

    Table  1  The water quality parameters of Chaohu Lake on Jan 10, 2003

    Table  2  The apparent reflectance of MODIS CH1—CH11 on Jan 10, 2003

    Table  3  Band spectral range of MODIS

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    • Received : 2007-11-14
    • Accepted : 2008-08-22
    • Published : 2009-02-28


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